Shell detects whether the IP entered is legitimate

Detects whether the IP entered is legitimate

#!/bin/bash

Read-p "Input An IP address:" Ip_addr

N1= ' echo $ip _addr|awk-f. ' {print $} '

N2= ' echo $ip _addr|awk-f. ' {print $} '

N3= ' echo $ip _addr|awk-f. ' {print $} '

N4= ' echo $ip _addr|awk-f. ' {print $4} '

If [$n 1-ge 1]&&[$n 1-lt 255]&&[$n 2-ge 1]&&[$n 2-lt 255]&&[$n 3-ge 1]&& [$n 3-lt 255]&&[$n 4-ge 1]&&[$n 4-lt 255]

Then

echo "Right IP."

Else

echo "Wrong IP."

Fi

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Shell detects whether the IP entered is legitimate